The IMF Working Papers series is designed to make IMF staff research available to a wide audience. Almost 300 Working Papers are released each year, covering a wide range of theoretical and analytical topics, including balance of payments, monetary and fiscal issues, global liquidity, and national and international economic developments.

This paper provides empirical evidence on the determinants of long-term growth performance in a sample of 55 developing countries grouped by income levels. The evidence indicates that a model incorporating the savings rate, export performance, expenditures on human capital development, the growth of population, and the real interest rate on external debt, explains the growth performance of these countries remarkably well. The model also suggests policies that would lead to higher long-run rates of growth.